Is there a way to combine multiple traits in order to define a new trait?

Question

Is there a way to combine multiple traits (by inheritance?) in order to define a new trait? I'm looking for something like concepts in C++:

auto concept newConcept<typename T> : concept1<T>, concept2<T>, concept3<T> {};

Suppose I want to make a new trait that inherits from Clone, Default and some other traits, is that possible?

I was searching for a question like this under the term "super traits" so I just comment it here and hopefully someone may find it with this term later. — fuma, Nov 25 '21 at 11:49

score 83 · Accepted Answer · edited Oct 12 '20 at 17:22

83

Yep!

trait NewTrait: Clone + Default + OtherTraits {}
impl<T> NewTrait for T where T: Clone + Default + OtherTraits {}

edited Oct 12 '20 at 17:22

Darrien

answered Nov 17 '14 at 22:45

sfackler

1

Thanks (tried this with commas... but it didn't work). I searched for this for a long time, too bad it is not in the guide. – BigEpsilon Nov 17 '14 at 22:58
1

It is mentioned in the reference, though: http://doc.rust-lang.org/reference.html#traits Yeah, I tripped up on this as well :) – Subhash Nov 18 '14 at 01:28
2

You can write a macro trait_alias as described in http://stackoverflow.com/questions/30291584/macro-for-defining-trait-aliases – malbarbo May 03 '16 at 17:44
This is called a blanket implementation https://users.rust-lang.org/t/what-are-blanket-implementations/49904 – debuti Sep 28 '22 at 16:39

1 Answers1